Buoyancy

Flash is the whole pitch here. Granting flying with an aura is among the oldest tricks in blue, but printing it at instant speed changes which combat decisions it can ambush. Two mana for a single keyword on a permanent that vanishes if the creature dies is an unremarkable rate; the timing window is the entire reason it works. The classic line is the surprise blocker: an evasive threat swings expecting to connect, and before blockers are declared you flash this onto a grounded creature so it can suddenly answer the air. It also serves the racing plan, slipping your ground beater past the opponent's wall at the last instant before the defending player commits, then revealing nothing until that beat. Most flying-granting auras of this kind were sorcery-speed commitments that telegraphed your plan a turn early and left you down a card if the creature died in response. Buoyancy hides the commitment until the moment evasion matters, on either side of the red zone, then forces the opponent to re-evaluate a combat step they thought was already mapped. The principle it is built around is precise: an evasion grant earns the most not when you hardcast it ahead of combat, but at the latest legal instant before blocks lock in, while the opponent is still deciding how to defend and assumes the air is empty.